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f9b0382faf
There's a few changes in here that are very inter-related. First, we stop lowering load_deref on shader_temp to load_ptr_dxil, and just leave it as load_deref. In order for that to work, we need the derefs to be in a shape that's acceptable to DXIL, so the only current producer of shader_temp loads (the CLC frontend) needs to run some lowering passes on them first. The DXIL backend is augmented to just write out deref indices while walking a deref chain, which will get combined in the load op into a GEP instruction. For non-mesh/raytracing shaders, these are required to be single-level scalar arrays, but the complexity here is preparation for when we don't need to do that anymore. Additionally, the const lookups are changed from using a hash table to just putting an index on the variable. All of this together is enough to enable the authored-forever-ago test which uses indirect array access into a const packed struct. The load_ptr_dxil handling didn't deal with packed structs / unaligned accesses, but now that we're in a logical address space with derefs instead of physical, there's no alignment to deal with anymore and the fact that it's packed goes out the window. This removes one custom DXIL intrinsic. Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/23173> |
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